//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// High frequency Legic commands
//-----------------------------------------------------------------------------
#include "cmdhflegic.h"

static int CmdHelp(const char *Cmd);

#define MAX_LENGTH 1024	

int usage_legic_calccrc(void){
	PrintAndLogEx(NORMAL, "Calculates the legic crc8/crc16 on the given data.");
	PrintAndLogEx(NORMAL, "There must be an even number of hexsymbols as input.");
	PrintAndLogEx(NORMAL, "Usage:  hf legic crc [h] d <data> u <uidcrc> c <8|16>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      d <data>      : (hex symbols) bytes to calculate crc over");
	PrintAndLogEx(NORMAL, "      u <uidcrc>    : MCC hexbyte");
	PrintAndLogEx(NORMAL, "      c <8|16>      : Crc type");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic crc d deadbeef1122");
	PrintAndLogEx(NORMAL, "      hf legic crc d deadbeef1122 u 9A c 16");
	return 0;
}
int usage_legic_rdmem(void){	
	PrintAndLogEx(NORMAL, "Read data from a legic tag.");
	PrintAndLogEx(NORMAL, "Usage:  hf legic rdmem [h] <offset> <length> <IV>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      <offset>      : (hex) offset in data array to start download from");
	PrintAndLogEx(NORMAL, "      <length>      : (hex) number of bytes to read");
	PrintAndLogEx(NORMAL, "      <IV>          : (hex) (optional) Initialization vector to use. Must be odd and 7bits max");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic rdmem 0 16        - reads from byte[0] 0x16 bytes(system header)");
	PrintAndLogEx(NORMAL, "      hf legic rdmem 0 4 55      - reads from byte[0] 0x4 bytes with IV 0x55");
	PrintAndLogEx(NORMAL, "      hf legic rdmem 0 100 55    - reads 0x100 bytes with IV 0x55");
	return 0;
}
int usage_legic_sim(void){
	PrintAndLogEx(NORMAL, "Simulates a LEGIC Prime tag. MIM22, MIM256, MIM1024 types can be emulated");
	PrintAndLogEx(NORMAL, "Use ELOAD/ESAVE to upload a dump into emulator memory");
	PrintAndLogEx(NORMAL, "Usage:  hf legic sim [h] <tagtype>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      <tagtype>     : 0 = MIM22");
	PrintAndLogEx(NORMAL, "                    : 1 = MIM256 (default)");
	PrintAndLogEx(NORMAL, "                    : 2 = MIM1024");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic sim 2");
	return 0;
}
int usage_legic_write(void){
	PrintAndLogEx(NORMAL, "Write data to a LEGIC Prime tag. It autodetects tagsize to make sure size");
	PrintAndLogEx(NORMAL, "Usage:  hf legic write [h] o <offset> d <data (hex symbols)>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      o <offset>    : (hex) offset in data array to start writing");
	//PrintAndLogEx(NORMAL, "  <IV>          : (optional) Initialization vector to use (ODD and 7bits)");
	PrintAndLogEx(NORMAL, "      d <data>      : (hex symbols) bytes to write ");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic write o 10 d 11223344    - Write 0x11223344 starting from offset 0x10");
	return 0;
}
int usage_legic_reader(void){
	PrintAndLogEx(NORMAL, "Read UID and type information from a legic tag.");
	PrintAndLogEx(NORMAL, "Usage:  hf legic reader [h]");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic reader");
	return 0;
}
int usage_legic_info(void){
	PrintAndLogEx(NORMAL, "Reads information from a legic prime tag.");
	PrintAndLogEx(NORMAL, "Shows systemarea, user areas etc");
	PrintAndLogEx(NORMAL, "Usage:  hf legic info [h]");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic info");
	return 0;
}
int usage_legic_dump(void){
	PrintAndLogEx(NORMAL, "Reads all pages from LEGIC Prime MIM22, MIM256, MIM1024");
	PrintAndLogEx(NORMAL, "and saves binary dump into the file `filename.bin` or `cardUID.bin`");
	PrintAndLogEx(NORMAL, "It autodetects card type.\n");	
	PrintAndLogEx(NORMAL, "Usage:  hf legic dump [h] o <filename w/o .bin>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      o <filename>  : filename w/o '.bin' to dump bytes");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic dump");
	PrintAndLogEx(NORMAL, "      hf legic dump o myfile");
	return 0;
}
int usage_legic_restore(void){
	PrintAndLogEx(NORMAL, "Reads binary file and it autodetects card type and verifies that the file has the same size");
	PrintAndLogEx(NORMAL, "Then write the data back to card. All bytes except the first 7bytes [UID(4) MCC(1) DCF(2)]\n");
	PrintAndLogEx(NORMAL, "Usage:   hf legic restore [h] i <filename w/o .bin>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      i <filename>  : filename w/o '.bin' to restore bytes on to card from");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic restore i myfile");
	return 0;
}
int usage_legic_eload(void){
	PrintAndLogEx(NORMAL, "It loads binary dump from the file `filename.bin`");
	PrintAndLogEx(NORMAL, "Usage:  hf legic eload [h] [card memory] <file name w/o `.bin`>");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");	
	PrintAndLogEx(NORMAL, "      [card memory] : 0 = MIM22");
	PrintAndLogEx(NORMAL, "                    : 1 = MIM256 (default)");
	PrintAndLogEx(NORMAL, "                    : 2 = MIM1024");
	PrintAndLogEx(NORMAL, "      <filename>    : filename w/o .bin to load");	
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "      hf legic eload 2 myfile");
	return 0;
}
int usage_legic_esave(void){
	PrintAndLogEx(NORMAL, "It saves binary dump into the file `filename.bin` or `cardID.bin`");
	PrintAndLogEx(NORMAL, " Usage:  hf legic esave [h] [card memory] [file name w/o `.bin`]");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "      [card memory] : 0 = MIM22");
	PrintAndLogEx(NORMAL, "                    : 1 = MIM256 (default)");
	PrintAndLogEx(NORMAL, "                    : 2 = MIM1024");
	PrintAndLogEx(NORMAL, "      <filename>    : filename w/o .bin to load");	
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");	
	PrintAndLogEx(NORMAL, "      hf legic esave 2 myfile");
	return 0;
}
int usage_legic_wipe(void){
	PrintAndLogEx(NORMAL, "Fills a legic tag memory with zeros. From byte7 and to the end.");
	PrintAndLogEx(NORMAL, " Usage:  hf legic wipe [h]");
	PrintAndLogEx(NORMAL, "Options:");
	PrintAndLogEx(NORMAL, "      h             : this help");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");	
	PrintAndLogEx(NORMAL, "      hf legic wipe");
	return 0;
}
/*
 *  Output BigBuf and deobfuscate LEGIC RF tag data.
 *  This is based on information given in the talk held
 *  by Henryk Ploetz and Karsten Nohl at 26c3
 */
int CmdLegicInfo(const char *Cmd) {

	char cmdp = tolower(param_getchar(Cmd, 0));
	if ( cmdp == 'h' ) return usage_legic_info();

	int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
	int crc = 0, wrp = 0, wrc = 0;
	uint8_t stamp_len = 0;
	uint16_t datalen = 0;
	char token_type[5] = {0,0,0,0,0};
	int dcf = 0;
	int bIsSegmented = 0;

	// tagtype
	legic_card_select_t card;
	if (legic_get_type(&card)) {
		PrintAndLogEx(WARNING, "Failed to identify tagtype");
		return 1;
	}

	PrintAndLogEx(NORMAL, "Reading tag memory %d b...", card.cardsize);
	
	// allocate receiver buffer
	uint8_t *data = calloc(card.cardsize, sizeof(uint8_t));
	 if (!data) {
		PrintAndLogEx(WARNING, "Cannot allocate memory");
		return 2;
	}

	int status = legic_read_mem(0, card.cardsize, 0x55, data, &datalen);
	if ( status > 0 ) {
		PrintAndLogEx(WARNING, "Failed reading memory");
		free(data);
		return 3;
	}
	
	// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
	crc = data[4];
	uint32_t calc_crc =  CRC8Legic(data, 4);	
	
	PrintAndLogEx(NORMAL, "\nCDF: System Area");
	PrintAndLogEx(NORMAL, "------------------------------------------------------");
	PrintAndLogEx(NORMAL, "MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
		data[0],
		data[1],
		data[2],
		data[3],
		data[4],
		(calc_crc == crc) ? "OK":"Fail"
	);
 
	// MCD = Manufacturer ID (should be list meaning something?)

	token_type[0] = 0;
	dcf = ((int)data[6] << 8) | (int)data[5];

	// New unwritten media?
	if (dcf == 0xFFFF) {

		PrintAndLogEx(NORMAL, "DCF: %d (%02x %02x), Token Type=NM (New Media)",
			dcf,
			data[5],
			data[6]
		);
	
	} else if (dcf > 60000) {		// Master token?

		int fl = 0;

		if (data[6] == 0xec) {
			strncpy(token_type, "XAM", sizeof(token_type));
			fl = 1;
			stamp_len = 0x0c - (data[5] >> 4);
		} else {
			switch (data[5] & 0x7f) {
			case 0x00 ... 0x2f:
				strncpy(token_type, "IAM", sizeof(token_type));
				fl = (0x2f - (data[5] & 0x7f)) + 1;
				break;
			case 0x30 ... 0x6f:
				strncpy(token_type, "SAM", sizeof(token_type));
				fl = (0x6f - (data[5] & 0x7f)) + 1;
				break;
			case 0x70 ... 0x7f:
				strncpy(token_type, "GAM", sizeof(token_type));
				fl = (0x7f - (data[5] & 0x7f)) + 1;
				break;
			}

			stamp_len = 0xfc - data[6];
		}

		PrintAndLogEx(NORMAL, "DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
			dcf,
			data[5],
			data[6],
			token_type,
			(data[5] & 0x80 )>> 7,
			stamp_len,
			fl
		);

	} else {	// Is IM(-S) type of card...

		if (data[7] == 0x9F && data[8] == 0xFF) {
			bIsSegmented = 1;
			strncpy(token_type, "IM-S", sizeof(token_type));
		} else {
			strncpy(token_type, "IM", sizeof(token_type));
		}

		PrintAndLogEx(NORMAL, "DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
			dcf,
			data[5],
			data[6],
			token_type,
			(data[5]&0x80) >> 7
		);
	}

	// Makes no sence to show this on blank media...
	if (dcf != 0xFFFF) {

		if (bIsSegmented) {
			PrintAndLogEx(NORMAL, "WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
				data[7] & 0x0f,
				(data[7] & 0x70) >> 4,
				(data[7] & 0x80) >> 7,
				data[8]
			);
		}

		// Header area is only available on IM-S cards, on master tokens this data is the master token data itself
		if (bIsSegmented || dcf > 60000) {
			if (dcf > 60000) {
				PrintAndLogEx(NORMAL, "Master token data");
				PrintAndLogEx(NORMAL, "%s", sprint_hex(data+8, 14));
			} else {
				PrintAndLogEx(NORMAL, "Remaining Header Area");
				PrintAndLogEx(NORMAL, "%s", sprint_hex(data+9, 13));
			}
		}
	}
	
	uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
	uint32_t segCalcCRC = 0;
	uint32_t segCRC = 0;

	// Not Data card?
	if (dcf > 60000)
		goto out;
	
	PrintAndLogEx(NORMAL, "\nADF: User Area");
	PrintAndLogEx(NORMAL, "------------------------------------------------------");

	if(bIsSegmented) {

		// Data start point on segmented cards
		i = 22;  

		// decode segments
		for (segmentNum=1; segmentNum < 128; segmentNum++ )
		{
			segment_len = ((data[i+1] ^ crc) & 0x0f) * 256 + (data[i] ^ crc);
			segment_flag = ((data[i+1] ^ crc) & 0xf0) >> 4;
			wrp = (data[i+2] ^ crc);
			wrc = ((data[i+3] ^ crc) & 0x70) >> 4;

			bool hasWRC = (wrc > 0);
			bool hasWRP = (wrp > wrc);
			int wrp_len = (wrp - wrc);
			int remain_seg_payload_len = (segment_len - wrp - 5);
	
			// validate segment-crc
			segCrcBytes[0]=data[0];			//uid0
			segCrcBytes[1]=data[1];			//uid1
			segCrcBytes[2]=data[2];			//uid2
			segCrcBytes[3]=data[3];			//uid3
			segCrcBytes[4]=(data[i] ^ crc);   //hdr0
			segCrcBytes[5]=(data[i+1] ^ crc); //hdr1
			segCrcBytes[6]=(data[i+2] ^ crc); //hdr2
			segCrcBytes[7]=(data[i+3] ^ crc); //hdr3

			segCalcCRC = CRC8Legic(segCrcBytes, 8);
			segCRC = data[i+4] ^ crc;

			PrintAndLogEx(NORMAL, "Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u,  Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
				segmentNum,
				data[i] ^ crc,
				data[i+1] ^ crc,
				data[i+2] ^ crc,
				data[i+3] ^ crc,
				segment_len, 
				segment_flag,
				(segment_flag & 0x4) >> 2,
				(segment_flag & 0x8) >> 3,
				wrp,
				wrc,
				((data[i+3]^crc) & 0x80) >> 7,
				segCRC,
				( segCRC == segCalcCRC ) ? "OK" : "fail"
			);

			i += 5;

			if ( hasWRC ) {
				PrintAndLogEx(NORMAL, "WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
				PrintAndLogEx(NORMAL, "\nrow  | data");
				PrintAndLogEx(NORMAL, "-----+------------------------------------------------");

				for ( k=i; k < (i + wrc); ++k)
					data[k] ^= crc;

				print_hex_break( data+i, wrc, 16);
		
				i += wrc;
			}

			if ( hasWRP ) {
				PrintAndLogEx(NORMAL, "Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
				PrintAndLogEx(NORMAL, "\nrow  | data");
				PrintAndLogEx(NORMAL, "-----+------------------------------------------------");

				for (k=i; k < (i+wrp_len); ++k)
					data[k] ^= crc;
		
				print_hex_break( data+i, wrp_len, 16);
		
				i += wrp_len;
		
				// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
				if( wrp_len == 8 )
					PrintAndLogEx(NORMAL, "Card ID: %2X%02X%02X", data[i-4]^crc, data[i-3]^crc, data[i-2]^crc);			
			}

			PrintAndLogEx(NORMAL, "Remaining segment payload:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
			PrintAndLogEx(NORMAL, "\nrow  | data");
			PrintAndLogEx(NORMAL, "-----+------------------------------------------------");

			for ( k=i; k < (i+remain_seg_payload_len); ++k)
				data[k] ^= crc;
	
			print_hex_break( data+i, remain_seg_payload_len, 16);

			i += remain_seg_payload_len;
	
			PrintAndLogEx(NORMAL, "-----+------------------------------------------------\n");

			// end with last segment
			if (segment_flag & 0x8) 
				goto out;

		} // end for loop
	
	} else {

		// Data start point on unsegmented cards
		i = 8;

		wrp = data[7] & 0x0F;
		wrc = (data[7] & 0x70) >> 4;

		bool hasWRC = (wrc > 0);
		bool hasWRP = (wrp > wrc);
		int wrp_len = (wrp - wrc);
		int remain_seg_payload_len = (1024 - 22 - wrp);	// Any chance to get physical card size here!?

		PrintAndLogEx(NORMAL, "Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
			wrp,
			wrc,
			(data[7] & 0x80) >> 7
		);

		if ( hasWRC ) {
			PrintAndLogEx(NORMAL, "WRC protected area:   (I %d | WRC %d)", i, wrc);
			PrintAndLogEx(NORMAL, "\nrow  | data");
			PrintAndLogEx(NORMAL, "-----+------------------------------------------------");
			print_hex_break( data+i, wrc, 16);
			i += wrc;
		}

		if ( hasWRP ) {
			PrintAndLogEx(NORMAL, "Remaining write protected area:  (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
			PrintAndLogEx(NORMAL, "\nrow  | data");
			PrintAndLogEx(NORMAL, "-----+------------------------------------------------");
			print_hex_break( data + i, wrp_len, 16);
			i += wrp_len;
		
			// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
			if( wrp_len == 8 )
				PrintAndLogEx(NORMAL, "Card ID: %2X%02X%02X", data[i-4], data[i-3], data[i-2]);
		}

		PrintAndLogEx(NORMAL, "Remaining segment payload:  (I %d | Remain LEN %d)", i, remain_seg_payload_len);
		PrintAndLogEx(NORMAL, "\nrow  | data");
		PrintAndLogEx(NORMAL, "-----+------------------------------------------------");
		print_hex_break( data + i, remain_seg_payload_len, 16);
		i += remain_seg_payload_len;
	
		PrintAndLogEx(NORMAL, "-----+------------------------------------------------\n");
	}

out:
	free(data);
	return 0;
}

// params:
// offset in data memory
// number of bytes to read
int CmdLegicRdmem(const char *Cmd) {

	char cmdp = tolower(param_getchar(Cmd, 0));
	if ( cmdp == 'h' ) return usage_legic_rdmem();
	
	uint32_t offset = 0, len = 0, iv = 1;
	uint16_t datalen = 0;
	sscanf(Cmd, "%x %x %x", &offset, &len, &iv);
	
	// sanity checks
	if ( len + offset >= MAX_LENGTH ) {
		PrintAndLogEx(WARNING, "Out-of-bounds, Cardsize = %d, [offset+len = %d ]", MAX_LENGTH, len + offset);
		return -1;
	}

	PrintAndLogEx(SUCCESS, "Reading %d bytes, from offset %d", len, offset);
	
	// allocate receiver buffer
	uint8_t *data = calloc(len, sizeof(uint8_t));
	if ( !data ){
		PrintAndLogEx(WARNING, "Cannot allocate memory");
		return -2;
	}
	
	int status = legic_read_mem(offset, len, iv, data, &datalen);
	if ( status == 0 ) {
	PrintAndLogEx(NORMAL, "\n ##  |  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F");
	PrintAndLogEx(NORMAL, "-----+------------------------------------------------------------------------------------------------");
		print_hex_break(data, datalen, 32);
	}
	free(data);
	return status;
}

int CmdLegicRfSim(const char *Cmd) {

	char cmdp = tolower(param_getchar(Cmd, 0));
	if ( strlen(Cmd) == 0 || cmdp == 'h' ) return usage_legic_sim();

	UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {1}};
	sscanf(Cmd, " %" SCNi64, &c.arg[0]);
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

int CmdLegicRfWrite(const char *Cmd) {

	uint8_t *data = NULL;
	uint8_t cmdp = 0;
	bool errors = false;
	int len = 0, bg, en;
	uint32_t offset = 0, IV = 0x55;
	
	while(param_getchar(Cmd, cmdp) != 0x00 && !errors) {
		switch (tolower(param_getchar(Cmd, cmdp))) {
		case 'd':
			// peek at length of the input string so we can
			// figure out how many elements to malloc in "data"
			bg=en=0;
			if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
				errors = true;
				break;
			}
			len = (en - bg + 1);

			// check that user entered even number of characters
			// for hex data string
			if (len & 1) {
				errors = true;
				break;
			}
			
			// limit number of bytes to write. This is not a 'restore' command.
			if ( (len>>1) > 100 ){
				PrintAndLogEx(WARNING, "Max bound on 100bytes to write a one time.");
				PrintAndLogEx(WARNING, "Use the 'hf legic restore' command if you want to write the whole tag at once");
				errors = true;
			}

			// it's possible for user to accidentally enter "b" parameter
			// more than once - we have to clean previous malloc
			if (data)
				free(data);
			
			data = calloc(len >> 1, sizeof(uint8_t));
			if ( data == NULL ) {
				PrintAndLogEx(WARNING, "Can't allocate memory. exiting");
				errors = true;
				break;
			}
			
			if (param_gethex(Cmd, cmdp+1, data, len)) {
				errors = true;
				break;
			}

			len >>= 1;	
			cmdp += 2;
			break;
		case 'o':
			offset = param_get32ex(Cmd, cmdp+1, 4, 16);
			cmdp += 2;
			break;
		case 'h':
			errors = true;
			break;
		default:
			PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
			errors = true;
			break;
		}
	}
	//Validations
	if (errors || cmdp == 0){
		if (data) 
			free(data);
		return usage_legic_write();
	}

	// tagtype
	legic_card_select_t card;
	if (legic_get_type(&card)) {
		PrintAndLogEx(WARNING, "Failed to identify tagtype");
		return -1;
	}

	legic_print_type(card.cardsize, 0);
	
	// OUT-OF-BOUNDS checks
	// UID 4+1 bytes can't be written to.
	if ( offset < 5 ) {
		PrintAndLogEx(WARNING, "Out-of-bounds, bytes 0-1-2-3-4 can't be written to. Offset = %d", offset);
		return -2;
	}
	
	if ( len + offset >= card.cardsize ) {
		PrintAndLogEx(WARNING, "Out-of-bounds, Cardsize = %d, [offset+len = %d ]", card.cardsize, len + offset);
		return -2;
	}

	if (offset == 5 || offset == 6) {
		PrintAndLogEx(NORMAL, "############# DANGER ################");
		PrintAndLogEx(NORMAL, "# changing the DCF is irreversible  #");
		PrintAndLogEx(NORMAL, "#####################################");
		char *answer = NULL;
		answer = readline("do you really want to continue? y(es) n(o) : ");
		bool overwrite = (answer[0] == 'y' || answer[0] == 'Y');
		if (!overwrite){
			PrintAndLogEx(NORMAL, "command cancelled");
			return 0;
		}
	}
	
	legic_chk_iv(&IV);
	
	PrintAndLogEx(SUCCESS, "Writing to tag");

	UsbCommand c = {CMD_WRITER_LEGIC_RF, {offset, len, IV}};
	memcpy(c.d.asBytes, data, len);	
	UsbCommand resp;
	clearCommandBuffer();
	SendCommand(&c);
	

	uint8_t timeout = 0;
	while (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
		++timeout;
		printf("."); fflush(stdout);
		if (timeout > 7) {
			PrintAndLogEx(WARNING, "\ncommand execution time out");
		return 1;
	}
	}	
	PrintAndLogEx(NORMAL, "\n");
	
	uint8_t isOK = resp.arg[0] & 0xFF;
	if ( !isOK ) {
		PrintAndLogEx(WARNING, "Failed writing tag");
		return 1;
	}

    return 0;
}

int CmdLegicCalcCrc(const char *Cmd){

	uint8_t *data = NULL;
	uint8_t cmdp = 0, uidcrc = 0, type=0;
	bool errors = false;
	int len = 0;
	int bg, en;
	
	while(param_getchar(Cmd, cmdp) != 0x00 && !errors) {
		switch (tolower(param_getchar(Cmd, cmdp))) {
		case 'd':
			// peek at length of the input string so we can
			// figure out how many elements to malloc in "data"
			bg=en=0;
			if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
				errors = true;
				break;
			}
			len = (en - bg + 1);

			// check that user entered even number of characters
			// for hex data string
			if (len & 1) {
				errors = true;
				break;
			}

			// it's possible for user to accidentally enter "b" parameter
			// more than once - we have to clean previous malloc
			if (data) free(data);
			data = calloc(len >> 1,  sizeof(uint8_t) );
			if ( data == NULL ) {
				PrintAndLogEx(WARNING, "Can't allocate memory. exiting");
				errors = true;
				break;
			}
			
			if (param_gethex(Cmd, cmdp+1, data, len)) {
				errors = true;
				break;
			}

			len >>= 1;	
			cmdp += 2;
			break;
		case 'u':
			uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
			cmdp += 2;
			break;
		case 'c':
			type = param_get8ex(Cmd, cmdp+1, 0, 10);
			cmdp += 2;
			break;
		case 'h':
			errors = true;
			break;
		default:
			PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
			errors = true;
			break;
		}
	}
	//Validations
	if (errors || cmdp == 0){
		if (data) free(data);
		return usage_legic_calccrc();
	}
	
	switch (type){
		case 16:
			init_table(CRC_LEGIC);
			PrintAndLogEx(SUCCESS, "Legic crc16: %X", crc16_legic(data, len, uidcrc));
			break;
		default:
			PrintAndLogEx(SUCCESS, "Legic crc8: %X",  CRC8Legic(data, len) );
			break;
	}
	
	if (data) free(data);
	return 0;
} 

int legic_read_mem(uint32_t offset, uint32_t len, uint32_t iv, uint8_t *out, uint16_t *outlen) {
	
	legic_chk_iv(&iv);
	
	UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, iv}};
	clearCommandBuffer();
	SendCommand(&c);
	UsbCommand resp;
	
	uint8_t timeout = 0;
	while (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
		++timeout;
		printf("."); fflush(stdout);
		if (timeout > 7) {
			PrintAndLogEx(WARNING, "\ncommand execution time out");
		return 1;
	}
	}	
	PrintAndLogEx(NORMAL, "\n");

	uint8_t isOK = resp.arg[0] & 0xFF;
	*outlen = resp.arg[1];
	if ( !isOK ) {
		PrintAndLogEx(WARNING, "Failed reading tag");
		return 2;
	}
	
	if ( *outlen != len )
		PrintAndLogEx(WARNING, "Fail, only managed to read %u bytes", *outlen);
	
	// copy data from device
	if ( !GetFromDevice( BIG_BUF_EML, out, *outlen, 0, NULL, 2500, false) ) {
		PrintAndLogEx(WARNING, "Fail, transfer from device time-out");
		return 4;
	}
	return 0;
}

int legic_print_type(uint32_t tagtype, uint8_t spaces){
	char spc[11] = "          ";
	spc[10]=0x00;
	char *spacer = spc + (10-spaces);

	if ( tagtype == 22 )	
		PrintAndLogEx(SUCCESS, "%sTYPE : MIM%d card (outdated)", spacer, tagtype);
	else if ( tagtype == 256 )
		PrintAndLogEx(SUCCESS, "%sTYPE : MIM%d card (234 bytes)", spacer, tagtype);
	else if ( tagtype == 1024 )
		PrintAndLogEx(SUCCESS, "%sTYPE : MIM%d card (1002 bytes)", spacer, tagtype);
	else
		PrintAndLogEx(INFO, "%sTYPE : Unknown %06x", spacer, tagtype);
	return 0;
}
int legic_get_type(legic_card_select_t *card){

	if ( card == NULL ) return 1;

	UsbCommand c = {CMD_LEGIC_INFO, {0,0,0}};
	clearCommandBuffer();
    SendCommand(&c);
	UsbCommand resp;
	if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500))
		return 2;
	
	uint8_t isOK = resp.arg[0] & 0xFF;
	if ( !isOK ) 
		return 3;
	
	memcpy(card, (legic_card_select_t *)resp.d.asBytes, sizeof(legic_card_select_t));
	return 0;
}
void legic_chk_iv(uint32_t *iv){
	if ( (*iv & 0x7F) != *iv ){
		*iv &= 0x7F;
		PrintAndLogEx(INFO, "Truncating IV to 7bits, %u", *iv);
	}
	// IV must be odd
	if ( (*iv & 1) == 0 ){
		*iv |= 0x01;  
		PrintAndLogEx(INFO, "LSB of IV must be SET %u", *iv);	
	}
}
void legic_seteml(uint8_t *src, uint32_t offset, uint32_t numofbytes) {
	size_t len = 0;

	UsbCommand c = {CMD_LEGIC_ESET, {0, 0, 0}};	
	for(size_t i = offset; i < numofbytes; i += USB_CMD_DATA_SIZE) {
		
		len = MIN((numofbytes - i), USB_CMD_DATA_SIZE);		
		c.arg[0] = i; // offset
		c.arg[1] = len; // number of bytes
		memcpy(c.d.asBytes, src+i, len); 
		clearCommandBuffer();
		SendCommand(&c);
	}
}

int HFLegicReader(const char *Cmd, bool verbose) {

	char cmdp = tolower(param_getchar(Cmd, 0));
	if ( cmdp == 'h' ) return usage_legic_reader();
	
	legic_card_select_t card;
	switch(legic_get_type(&card)){
		case 1: 
			return 2;
		case 2: 
			if ( verbose ) PrintAndLogEx(WARNING, "command execution time out"); 
			return 1;
		case 3: 
			if ( verbose ) PrintAndLogEx(WARNING, "legic card select failed");
			return 2;
		default: break;
	}
	PrintAndLogEx(SUCCESS, " UID : %s", sprint_hex(card.uid, sizeof(card.uid)));
	legic_print_type(card.cardsize, 0);
	return 0;
}
int CmdLegicReader(const char *Cmd){
	return HFLegicReader(Cmd, true);
}

int CmdLegicDump(const char *Cmd){

	FILE *f;
	char filename[FILE_PATH_SIZE] = {0x00};
	char *fnameptr = filename;
	size_t fileNlen = 0;
	bool errors = false;
	uint16_t dumplen;	
	uint8_t cmdp = 0;
	
	memset(filename, 0, sizeof(filename));
	
	while(param_getchar(Cmd, cmdp) != 0x00 && !errors) {
		switch (tolower(param_getchar(Cmd, cmdp))) {
			case 'h':
				return usage_legic_dump();
			case 'o':
				fileNlen = param_getstr(Cmd, cmdp+1, filename, FILE_PATH_SIZE);
				if (!fileNlen) 
					errors = true; 
				if (fileNlen > FILE_PATH_SIZE-5) 
					fileNlen = FILE_PATH_SIZE-5;
				cmdp += 2;
				break;
			default:
				PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
				errors = true;
				break;
		}
	}
	//Validations
	if (errors) return usage_legic_dump();
	
	// tagtype
	legic_card_select_t card;
	if (legic_get_type(&card)) {
		PrintAndLogEx(WARNING, "Failed to identify tagtype");
		return -1;
	}
	dumplen = card.cardsize;
	
	legic_print_type(dumplen, 0);	
	PrintAndLogEx(SUCCESS, "Reading tag memory %d b...", dumplen);

	UsbCommand c = {CMD_READER_LEGIC_RF, {0x00, dumplen, 0x55}};
	clearCommandBuffer();
	SendCommand(&c);
	UsbCommand resp;

	uint8_t timeout = 0;
	while (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
		++timeout;
		printf("."); fflush(stdout);
		if (timeout > 7) {
			PrintAndLogEx(WARNING, "\ncommand execution time out");
		return 1;
	}
	}	
	PrintAndLogEx(NORMAL, "\n");
		
	uint8_t isOK = resp.arg[0] & 0xFF;
	if ( !isOK ) {
		PrintAndLogEx(WARNING, "Failed dumping tag data");
		return 2;
	}

	uint16_t readlen = resp.arg[1];
	uint8_t *data = calloc(readlen, sizeof(uint8_t));
	if (!data) {
		PrintAndLogEx(WARNING, "Fail, cannot allocate memory");
		return 3;
	}
	
	if ( readlen != dumplen )
		PrintAndLogEx(WARNING, "Fail, only managed to read 0x%02X bytes of 0x%02X", readlen, dumplen);

	// copy data from device
	if (!GetFromDevice( BIG_BUF_EML, data, readlen, 0, NULL, 2500, false) ) {
		PrintAndLogEx(WARNING, "Fail, transfer from device time-out");
		free(data);
		return 4;
	}

	// user supplied filename?
	if (fileNlen < 1)
		sprintf(fnameptr,"%02X%02X%02X%02X.bin", data[0], data[1], data[2], data[3]);
	else
		sprintf(fnameptr + fileNlen,".bin");

	f = fopen(filename,"wb");
	if (!f) { 
		PrintAndLogEx(WARNING, "Could not create file name %s", filename);
		if (data)
			free(data);
		return 5;
	}
	fwrite(data, 1, readlen, f);
	fflush(f);
	fclose(f);
	free(data);
	PrintAndLogEx(SUCCESS, "Wrote %d bytes to %s", readlen, filename);
	return 0;
}	

int CmdLegicRestore(const char *Cmd){

	FILE *f;
	char filename[FILE_PATH_SIZE] = {0x00};
	char *fnameptr = filename;
	size_t fileNlen = 0;
	bool errors = false;
	uint16_t numofbytes;	
	uint8_t cmdp = 0;
	
	memset(filename, 0, sizeof(filename));
	
	while(param_getchar(Cmd, cmdp) != 0x00 && !errors) {
		switch (tolower(param_getchar(Cmd, cmdp))) {
			case 'h':
				errors = true;
				break;
			case 'i':
				fileNlen = param_getstr(Cmd, cmdp+1, filename, FILE_PATH_SIZE);
				if (!fileNlen) 
					errors = true;
				
				if (fileNlen > FILE_PATH_SIZE-5) 
					fileNlen = FILE_PATH_SIZE-5;
				cmdp += 2;				
				break;
			default:
				PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
				errors = true;
				break;
		}
	}
	//Validations
	if (errors || cmdp == 0) return usage_legic_restore();
	
	// tagtype
	legic_card_select_t card;
	if (legic_get_type(&card)) {
		PrintAndLogEx(WARNING, "Failed to identify tagtype");
		return 1;
	}
	numofbytes = card.cardsize;	
	
	// set up buffer
	uint8_t *data = calloc(numofbytes, sizeof(uint8_t) );
	if (!data) {
		PrintAndLogEx(WARNING, "Fail, cannot allocate memory");
		return 2;		
	}
	
	legic_print_type(numofbytes, 0);	

	// set up file
	fnameptr += fileNlen;
	sprintf(fnameptr, ".bin");

	f = fopen(filename,"rb");
	if (!f) {
		PrintAndLogEx(WARNING, "File %s not found or locked", filename);
		return 3;
	}	
	
	// verify size of dumpfile is the same as card.	
	fseek(f, 0, SEEK_END); // seek to end of file
	size_t filesize = ftell(f); // get current file pointer
	fseek(f, 0, SEEK_SET); // seek back to beginning of file
	
	if ( filesize != numofbytes) {
		PrintAndLogEx(WARNING, "Fail, filesize and cardsize is not equal. [%u != %u]", filesize, numofbytes);
		free(data);
		fclose(f);
		return 4;
	}

	// load file
	size_t bytes_read = fread(data, 1, numofbytes, f);
	fclose(f);
	
	if ( bytes_read == 0){
		PrintAndLogEx(WARNING, "File reading error");
		free(data);
		return 2;
	}
	
	PrintAndLogEx(SUCCESS, "Restoring to card");

	// transfer to device
	size_t len = 0;
	UsbCommand c = {CMD_WRITER_LEGIC_RF, {0, 0, 0x55}};
	UsbCommand resp;
	for(size_t i = 7; i < numofbytes; i += USB_CMD_DATA_SIZE) {
		
		len = MIN((numofbytes - i), USB_CMD_DATA_SIZE);		
		c.arg[0] = i; // offset
		c.arg[1] = len; // number of bytes
		memcpy(c.d.asBytes, data+i, len); 
		clearCommandBuffer();
		SendCommand(&c);
	
		uint8_t timeout = 0;
		while (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
			++timeout;
			printf("."); fflush(stdout);
			if (timeout > 7) {
				PrintAndLogEx(WARNING, "\ncommand execution time out");
			free(data);	
			return 1;
		}
		}	
		PrintAndLogEx(NORMAL, "\n");
		
		uint8_t isOK = resp.arg[0] & 0xFF;
		if ( !isOK ) {
			PrintAndLogEx(WARNING, "Failed writing tag [msg = %u]", resp.arg[1] & 0xFF);
			free(data);	
			return 1;
		}
		PrintAndLogEx(SUCCESS, "Wrote chunk [offset %d | len %d | total %d", i, len, i+len);
	}	
	
	free(data);	
	PrintAndLogEx(SUCCESS, "\nWrote %d bytes to card from file %s", numofbytes, filename);
	return 0;
}

int CmdLegicELoad(const char *Cmd) {
	FILE * f;
	char filename[FILE_PATH_SIZE];
	char *fnameptr = filename;
	int len, numofbytes;
	int nameParamNo = 1;
	
	char cmdp = tolower(param_getchar(Cmd, 0));
	if ( cmdp == 'h' || cmdp == 0x00)
		return usage_legic_eload();

	switch (cmdp) {
		case '0' : numofbytes = 22; break;
		case '1' : 
		case '\0': numofbytes = 256; break;
		case '2' : numofbytes = 1024; break;
		default  : numofbytes = 256;  nameParamNo = 0;break;
	}

	// set up buffer
	uint8_t *data = calloc(numofbytes, sizeof(uint8_t));
	if (!data) {
		PrintAndLogEx(WARNING, "Fail, cannot allocate memory");
		return 3;		
	}
	
	// set up file
	len = param_getstr(Cmd, nameParamNo, filename, FILE_PATH_SIZE);
	if (len > FILE_PATH_SIZE - 5) 
		len = FILE_PATH_SIZE - 5;
	fnameptr += len;
	sprintf(fnameptr, ".bin");
	
	// open file
	f = fopen(filename,"rb");
	if (!f) { 
		PrintAndLogEx(WARNING, "File %s not found or locked", filename);
		free(data);
		return 1;
	}

	// load file
	size_t bytes_read = fread(data, 1, numofbytes, f);
	if ( bytes_read == 0){
		PrintAndLogEx(WARNING, "File reading error");
		free(data);
		fclose(f);
		f = NULL;		
		return 2;
	}
	fclose(f);
	f = NULL;
	
	// transfer to device
	legic_seteml(data, 0, numofbytes);
		
	free(data);	
	PrintAndLogEx(SUCCESS, "\nLoaded %d bytes from file: %s  to emulator memory", numofbytes, filename);
	return 0;
}

int CmdLegicESave(const char *Cmd) {

	char filename[FILE_PATH_SIZE];
	char *fnameptr = filename;
	int fileNlen, numofbytes, nameParamNo = 1;
	FILE* f;	
	memset(filename, 0, sizeof(filename));

	char cmdp = tolower(param_getchar(Cmd, 0));
	
	if ( cmdp == 'h' || cmdp == 0x00)
		return usage_legic_esave();

	switch (cmdp) {
		case '0' : numofbytes = 22; break;
		case '1' : 
		case '\0': numofbytes = 256; break;
		case '2' : numofbytes = 1024; break;
		default  : numofbytes = 256; nameParamNo = 0; break;
	}

	fileNlen = param_getstr(Cmd, nameParamNo, filename, FILE_PATH_SIZE);
	
	if (fileNlen > FILE_PATH_SIZE - 5) 
		fileNlen = FILE_PATH_SIZE - 5;

	// set up buffer
	uint8_t *data = calloc(numofbytes, sizeof(uint8_t));
	if (!data) {
		PrintAndLogEx(WARNING, "Fail, cannot allocate memory");
		return 3;		
	}
		
	// download emulator memory
	PrintAndLogEx(SUCCESS, "Reading emulator memory...");	
	if (!GetFromDevice( BIG_BUF_EML, data, numofbytes, 0, NULL, 2500, false)) {
		PrintAndLogEx(WARNING, "Fail, transfer from device time-out");
		free(data);
		return 4;
	}
	// user supplied filename?
	if (fileNlen < 1)		
		sprintf(fnameptr,"%02X%02X%02X%02X.bin", data[0], data[1], data[2], data[3]);
	else
		sprintf(fnameptr + fileNlen,".bin");
	
	// open file
	f = fopen(filename,"wb");
	if (!f) { 
		PrintAndLogEx(WARNING, "Could not create file name %s", filename);
		free(data);
		return 1;
	}
	fwrite(data, 1, numofbytes, f);
	fclose(f);
	free(data);
	PrintAndLogEx(NORMAL, "\nSaved %d bytes from emulator memory to file: %s", numofbytes, filename);
	return 0;
}

int CmdLegicWipe(const char *Cmd){

	char cmdp = tolower(param_getchar(Cmd, 0));
	
	if ( cmdp == 'h') return usage_legic_wipe();
	
	// tagtype
	legic_card_select_t card;
	if (legic_get_type(&card)) {
		PrintAndLogEx(WARNING, "Failed to identify tagtype");
		return 1;
	}
	
	// set up buffer
	uint8_t *data = calloc(card.cardsize, sizeof(uint8_t));
	if (!data) {
		PrintAndLogEx(WARNING, "Fail, cannot allocate memory");
		return 2;		
	}
	
	legic_print_type(card.cardsize, 0);

	PrintAndLogEx(SUCCESS, "Erasing");
	
	// transfer to device
	size_t len = 0;
	UsbCommand c = {CMD_WRITER_LEGIC_RF, {0, 0, 0x55}};
	UsbCommand resp;
	for(size_t i = 7; i < card.cardsize; i += USB_CMD_DATA_SIZE) {
		
		printf("."); fflush(stdout);
		len = MIN((card.cardsize - i), USB_CMD_DATA_SIZE);		
		c.arg[0] = i; // offset
		c.arg[1] = len; // number of bytes
		memcpy(c.d.asBytes, data+i, len); 
		clearCommandBuffer();
		SendCommand(&c);
	
		uint8_t timeout = 0;
		while (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
			++timeout;
			printf("."); fflush(stdout);
			if (timeout > 7) {
				PrintAndLogEx(WARNING, "\ncommand execution time out");
			free(data);	
			return 3;
		}
		}	
		PrintAndLogEx(NORMAL, "\n");		

		uint8_t isOK = resp.arg[0] & 0xFF;
		if ( !isOK ) {
			PrintAndLogEx(WARNING, "Failed writing tag [msg = %u]", resp.arg[1] & 0xFF);
			free(data);	
			return 4;
		}
	}
	PrintAndLogEx(SUCCESS, "ok\n");
	return 0;
}

int CmdLegicList(const char *Cmd) {
	CmdTraceList("legic");
	return 0;
}

static command_t CommandTable[] =  {
	{"help",	CmdHelp,			1, "This help"},
	{"reader",	CmdLegicReader,		1, "LEGIC Prime Reader UID and tag info"},
	{"info",	CmdLegicInfo,		0, "Display deobfuscated and decoded LEGIC Prime tag data"},
	{"dump",	CmdLegicDump,		0, "Dump LEGIC Prime tag to binary file"},
	{"restore", CmdLegicRestore,	0, "Restore a dump file onto a LEGIC Prime tag"},
	{"rdmem",	CmdLegicRdmem,		0, "Read bytes from a LEGIC Prime tag"},
	{"sim",		CmdLegicRfSim,		0, "Start tag simulator"},
	{"write",	CmdLegicRfWrite,	0, "Write data to a LEGIC Prime tag"},
	{"crc",		CmdLegicCalcCrc,	1, "Calculate Legic CRC over given bytes"},	
	{"eload",	CmdLegicELoad,		1, "Load binary dump to emulator memory"},
	{"esave",	CmdLegicESave,		1, "Save emulator memory to binary file"},
	{"list",	CmdLegicList,		1, "[Deprecated] List LEGIC history"},
	{"wipe",	CmdLegicWipe,		1, "Wipe a LEGIC Prime tag"},
	{NULL, NULL, 0, NULL}
};

int CmdHFLegic(const char *Cmd) {
	clearCommandBuffer();
	CmdsParse(CommandTable, Cmd);
	return 0;
}

int CmdHelp(const char *Cmd) {
	CmdsHelp(CommandTable);
	return 0;
}